63910721897 has 8 divisors (see below), whose sum is σ = 72752126400. Its totient is φ = 55574540560.

The previous prime is 63910721879. The next prime is 63910721899. The reversal of 63910721897 is 79812701936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63910721897 - 2¹⁴ = 63910705513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63910721899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126305522 + ... + 126306027.

It is an arithmetic number, because the mean of its divisors is an integer number (9094015800).

Almost surely, 2^63910721897 is an apocalyptic number.

It is an amenable number.

63910721897 is a deficient number, since it is larger than the sum of its proper divisors (8841404503).

63910721897 is a wasteful number, since it uses less digits than its factorization.

63910721897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252611583.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 63910721897 in words is "sixty-three billion, nine hundred ten million, seven hundred twenty-one thousand, eight hundred ninety-seven".